code: def save_variable_buffer(info):
      # make the followings to save memory usage for Variable Buffer:
      #  - actual_buf_sizes(list): sizes of actual buffers, which lie under Variable Buffer.
      #                            indices in this list are hereinafter called 'actual buffer index'
      #  - vidx_to_abidx(dict): assignment of actual buffers to Variable Buffer.
      #                         the key and the value are Variable index and actual buffer index, respectively
      buf_var_lives = __make_buf_var_lives(info)
      actual_buf_sizes = __compute_actual_buf_sizes(info, buf_var_lives)
      buf_var_refs = __make_buf_var_refs(info, buf_var_lives)
      vidx_to_abidx = __assign_actual_buf_to_variable(
          info, actual_buf_sizes, buf_var_refs
      )
  
      return list(actual_buf_sizes), vidx_to_abidx
  
file_path: nnabla/python/src/nnabla/utils/converter/nnablart/save_variable_buffer.py
imports: import numpy
label_desc: Use image node_id 6 for calling a global function with example usage: save_variable_buffer(info) and returns: list,  vidx_to_abidx